You stated that you had both high and low-side drive to the FET gates. Is that still true?
What's the DCV across the high-side drain and the low-side source terminals?
What's the DCV across the high-side drain and the low-side source terminals?
Both the high side and low side have a 50hz square wave on the gate.
About 0.558v across the lowside source and high side drain
About 0.558v across the lowside source and high side drain
DCV measured across COM and VCC and again for VS and VB for both ICs? << 4 voltages.
If you use a meter/scope probe to temporarily connect the SD terminal to its solder pad, does the voltage across the lamp drop significantly? Try this for each IC.
If you use a meter/scope probe to temporarily connect the SD terminal to its solder pad, does the voltage across the lamp drop significantly? Try this for each IC.
12v across COM and VCC for both
Across VS and VB, 12.1v on both with signal generator on, 11.59v and 12.14v with signal generator off
I disabled the SD near the photocouplers, as it's just 1 resistor to remove voltage for both. So I only can enable both at once.
Enabling SD doesn't change voltage drop across the lamp.
Across VS and VB, 12.1v on both with signal generator on, 11.59v and 12.14v with signal generator off
I disabled the SD near the photocouplers, as it's just 1 resistor to remove voltage for both. So I only can enable both at once.
Enabling SD doesn't change voltage drop across the lamp.
Are you 100% sure that the output FETs are good?
Had you ever powered up with the lamp in place but no output FETs?
Had you ever powered up with the lamp in place but no output FETs?
without output FETs still doesn't power on. But I have found out that gates now receive a 50hz square wave even without a signal.
The 50hz square wave coming from the LM319M, the inputs don't seem to have anything, but outputs 50hz square wave on both outputs
The 50hz square wave coming from the LM319M, the inputs don't seem to have anything, but outputs 50hz square wave on both outputs
Are you sure that the 50Hz signal isn't everywhere? It sounds like a bad ground in a location where 50Hz is the mains frequency.
50hz is the mains frequency, but the 50hz square wave seems to appear after the LM319.
Another thing I noticed is that the PSU side the gate is switching at 25khz for 1ms, then off for 2ms and so on, is this normal?
Another thing I noticed is that the PSU side the gate is switching at 25khz for 1ms, then off for 2ms and so on, is this normal?
Does the MCU generate all PS drive signals?
If so, which pins have a changing voltage in sync with the pulsing of the PS drive?
If so, which pins have a changing voltage in sync with the pulsing of the PS drive?
The MCU does generate the PSU fet drive signal (pins 5 and 6), which goes to a 27524. It's input has a constant 25khz square wave, outputs have the gaps
Yeah, PSU fets have the gaps, outputs seem to have 50hz, but it's very inconsistent, plugging in an rca can change it to 40hz. So I guess I wouldn't pay much attention to it yet, as playing some signal changes it to the signals frequency.
I'm trying to understand. The MCU PS output is constant. but the output of the driver IC is pulsed?
Are the enable pins of the driver IC being pulsed?
Are the enable pins of the driver IC being pulsed?
Exactly, that is weird behaviour.
Enable pins are high. Without remote VDD and enable pins are at 12v, with remote they drop down to ~4v. But they are constant
Enable pins are high. Without remote VDD and enable pins are at 12v, with remote they drop down to ~4v. But they are constant